Haveing problems regestering my magic jack

this is Cassandra Williams when I brought my magicjack from walmart and pluged it into the wall it was working Saturday it told me on my phone please regester in order to make calls I have tried everything I also have an account with magicjack but when I tried to regester it did not tell me did I have a magicjack or where did I get it from I belive that's why I cant make calls because this information did not come up